From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755286Ab0JTAXQ (ORCPT ); Tue, 19 Oct 2010 20:23:16 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:51489 "EHLO fgwmail5.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754298Ab0JTAXN (ORCPT ); Tue, 19 Oct 2010 20:23:13 -0400 X-SecurityPolicyCheck-FJ: OK by FujitsuOutboundMailChecker v1.3.1 Date: Wed, 20 Oct 2010 09:17:46 +0900 From: KAMEZAWA Hiroyuki To: steve@digidescorp.com Cc: balbir@linux.vnet.ibm.com, linux-mm@kvack.org, dhowells@redhat.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH V2] nommu: add anonymous page memcg accounting Message-Id: <20101020091746.f0cc5dc2.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: <1287512657.2500.31.camel@iscandar.digidescorp.com> References: <1287491654-4005-1-git-send-email-steve@digidescorp.com> <20101019154819.GC15844@balbir.in.ibm.com> <1287512657.2500.31.camel@iscandar.digidescorp.com> Organization: FUJITSU Co. LTD. X-Mailer: Sylpheed 3.0.3 (GTK+ 2.10.14; i686-pc-mingw32) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 19 Oct 2010 13:24:17 -0500 "Steven J. Magnani" wrote: > On Tue, 2010-10-19 at 21:18 +0530, Balbir Singh wrote: > > * Steven J. Magnani [2010-10-19 07:34:14]: > > > > > Add the necessary calls to track VM anonymous page usage (only). > > > > > > V2 changes: > > > * Added update of memory cgroup documentation > > > * Clarify use of 'file' to distinguish anonymous mappings > > > > > > Signed-off-by: Steven J. Magnani > > > --- > > > diff -uprN a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt > > > --- a/Documentation/cgroups/memory.txt 2010-10-05 09:14:36.000000000 -0500 > > > +++ b/Documentation/cgroups/memory.txt 2010-10-19 07:28:04.000000000 -0500 > > > @@ -34,6 +34,7 @@ Current Status: linux-2.6.34-mmotm(devel > > > > > > Features: > > > - accounting anonymous pages, file caches, swap caches usage and limiting them. > > > + NOTE: On NOMMU systems, only anonymous pages are accounted. > > > - private LRU and reclaim routine. (system's global LRU and private LRU > > > work independently from each other) > > > - optionally, memory+swap usage can be accounted and limited. > > > @@ -640,7 +641,30 @@ At reading, current status of OOM is sho > > > under_oom 0 or 1 (if 1, the memory cgroup is under OOM, tasks may > > > be stopped.) > > > > > > -11. TODO > > > +11. NOMMU Support > > > > + > > > +At the present time, only anonymous pages are included in NOMMU memory cgroup > > > +accounting. > > > > What is the reason for tracking just anonymous memory? > > Tracking more than that is beyond my current scope, and perhaps of > limited benefit under an assumption that NOMMU systems don't usually > work with large files. The limitations of the implementation are > documented, so hopefully anyone who needs more functionality will know > that they need to implement it. > What happens at reaching limit ? memory can be reclaimed ? Thanks, -Kame